You should never cast a curse or anything harmful on other people, but I will tell you how to cast Havana syndrome for its folkloric value and because all communists have the ability to cast it. It is associated with The Jade Chairman and therefore comrades are immune to this type of magic. It can only affect class enemies and attempting it outside of that context, or on a person that is spiritually protected can cause it to backfire or may alert the person who can send something back.
For this spell, take some clay and mold it into the shape of a person. Then take that clay figure, and write the name of a person on it who you want to cast Havana syndrome on and put the doll into the oven for a few seconds. You should spray yourself in florida water and use bay leaves on the clay doll by rubbing them in or putting them inside the clay, so that you separate your energies from the energies of the person you are casting the spell on. You should also cleanse yourself with florida water or other things to prevent any negative energy from catching you. A few seconds in the microwave causes Havana syndrome, but a longer time may cause the person to mysteriously just die. Other possible outcomes are that they don’t get Havana syndrome, but they are removed from power or revolutionary sentiment causes them to be physically assaulted or harmed or they may be removed from their position.
Once the clay effigy is out of the oven, say “I call upon the chairman, the god of the class struggle to bring Havana syndrome onto this person for their crimes against the working class!” and then give it time. You are likely to hear confirmation of your manifestation such as seeing political dissent or they may complain of symptoms from the spell. Give it time to manifest, and allow the power of class struggle to work its magic.